SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
   ExpressionList (children 1)
    OrderByElement (children 1)
     Function intDiv (children 1)
      ExpressionList (children 2)
       Function multiply (children 1)
        ExpressionList (children 2)
         Function plus (children 1)
          ExpressionList (children 2)
           Identifier a
           Identifier b
         Identifier c
       Literal UInt64_2
